Sometimes my computer does not realise any built-in imput but I have an external mouse and with it I used to click on the Restart option in the indicator and during the reboot it stops somewhere leaving a blank screen behind. In this state I can't simply turn it off by pressing the power button it only shuts down after a 20 second press.
There is no problem when I simply press the power button on LightDM, in this case it shuts down correctly.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: lightdm 1.8.5-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
Uname: Linux 3.11.0-18-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
Date: Sun Mar 23 07:06:43 2014
InstallationDate: Installed on 2014-03-13 (9 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2014-04-20 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
Package: lightdm 1.10.0-0ubuntu3
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Tags: trusty
Uname: Linux 3.13.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
It's still an issue on Ubuntu 12.04 fresh install.